RU2468883C1 - Forging manipulator tongs head (versions) - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to auxiliary equipment of forging shops, particularly, to forging manipulators used in machining metals and alloys titanium subgroup, and other refractory metals and alloys. Tongs head comprises body, main clamping jaws with extra jaws, fasteners, control elements of the latter and tongs head. In compliance with one of invention versions, jaws working surfaces are provided with protective layer from zirconium dioxide or nitride. In compliance with another version, extra jaws are made from zirconium allow with zirconium oxide film on working surfaces.

EFFECT: decreased heat conductivity of extra jaws, higher quality of forgings.

2 cl, 2 dwg

Description

The invention relates to auxiliary equipment for forging and stamping production, namely, to designs of tick heads of forging manipulators used in the processing of metals and alloys of the titanium subgroup, as well as other refractory metals and alloys.

Known tick head of the forging manipulator, comprising a housing, clamping jaws with working surfaces and a mechanism for controlling the jaws (Mironov V.G. et al. Design of forging manipulators. M., Mechanical Engineering, 1970, p.13).

The known tick head does not provide the required quality of forgings due to the formation of forging defects in it (forging, delamination, flaws) caused by significant heat loss of the heated deformable metal forgings through the lips of the manipulator tick head. As a result of this, there is a decrease in the quality of forgings, the level of rejects increases, the yield of metal decreases, which ultimately leads to an increase in the cost of manufacturing forgings.

The closest analogue to the claimed inventions in technical essence and the achieved result is the known forging head of the forging manipulator, comprising a housing, main clamping jaws, additional jaws mounted in the main jaws, fasteners and jaw and head control mechanisms (AS USSR No. 1055583 , B21J 13/12, B25J 15/00 Tick-head of the forging manipulator, publ. 11/23/1983, bull. No. 43).

The known tick head also does not provide the required quality of forgings due to the formation of forging defects in it (forging, delamination, flaws) caused by a significant loss of heat of the heated deformable metal forgings through the lips of the manipulator tick head. As a result of this, there is a decrease in the quality of forgings, the level of rejects increases, the yield of metal decreases, which ultimately leads to an increase in the cost of manufacturing forgings.

The claimed invention solves the problem of reducing the cost of manufacturing forgings and improving their quality.

The technical result is achieved by the fact that in the first embodiment, in contrast to the known forging head of the forging manipulator, comprising a housing, main clamping jaws, additional jaws mounted in the main jaws, fastening elements and jaw and head control mechanisms, additional jaws are made with a protective layer of zirconium dioxide or nitride on work surfaces.

The technical result is achieved in that in the second embodiment, in contrast to the known forging head of the forging manipulator, comprising a housing, main clamping jaws, additional jaws mounted in the main jaws, fastening elements and jaw and head control mechanisms, additional jaws are made of zirconium alloy with zirconium oxide film on work surfaces.

The implementation of additional sponges with a protective layer of zirconium dioxide or nitride on the working surfaces, as well as their production from a zirconium alloy with a zirconium oxide film on the working surfaces, reduces the thermal conductivity of the working surfaces of the additional sponges in which the heated workpiece is clamped with ~ 41 W / m ° K (for steel) up to ~ 2.2 W / m ° K (for protective layer) at 300 ° C. As a result of this, heat losses are significantly reduced and forging defects (cracks, delaminations, flaws) are excluded in the finished forging, which leads to a significant improvement in the quality of forgings, to a decrease in the level of rejection, to an increase in metal yield, to lower costs for the elimination of forging defects, which ultimately leads to a reduction in the cost of manufacturing forgings.

A protective layer of zirconium dioxide or nitride is applied to the working surfaces of additional sponges by spraying or surfacing methods.

The oxide layer on the working surfaces of additional sponges made of zirconium alloy is created by oxidation in a heating furnace.

When analyzing patent and scientific and technical sources, no technical solutions were found that possess the entire set of essential features claimed in these inventions, which allows us to conclude that they meet the criterion of "novelty."

Comparison of the claimed inventions with other technical solutions in the art shows that a metal die is known for crimping on a slab edge coated with a protective sheath (Japanese application No. 63-212029, B21J 13/00, B21B 15/00, publ. 05.09.1988) . Also known are forging dies, punch sections and die dies in contact with the material being processed are provided with a coating providing significant creep resistance and heat resistance of these sections (Japanese Application No. 93304154, B21J 13/02, publ. 03.12.1993).

Figure 1 shows the tick head of the forging manipulator according to the version of the tick head, in which the additional jaws are made of zirconium alloy with a film of zirconium oxide on the working surfaces.

Figure 2 shows a view A of the tick head of the forging manipulator.

The tick head of the forging manipulator (FIGS. 1, 2) comprises a housing 1, main clamping jaws 2, additional jaws 3 mounted in the main jaws, a protective layer 4 of zirconium dioxide or nitride on the working surfaces of the additional jaws 3, fastening elements (not shown) and jaw and head control mechanisms (not shown).

The tick head with additional jaws made of zirconium alloy with a film of zirconium oxide on the working surfaces has a similar appearance.

A tick head according to any one of the options is used as follows.

Using a sponge control mechanism (not shown), the main 2 and additional 3 sponges are mounted, with a protective coating layer mounted at a distance greater than the diameter of the workpiece. The tick head of the forging manipulator is moved to the billet heating zone using a control mechanism (not shown) and brought to the heating furnace so that the axes of the additional jaws 3 approximately coincide with the axis of symmetry of the heated billet. Using a jaw control mechanism (not shown), the heated workpiece is clamped by the working surfaces of the additional jaws 3 with a protective coating layer. The heated billet with the help of a manipulator is moved to the work area of the forging press and forged. Next, the resulting workpiece is transferred to the storage area, placed on a rack and, using the jaw control mechanism (not shown), extends an additional 3 and, together with them, the main 2 jaws. The tick head of the forging manipulator is again moved to the heating zone of the workpieces and the work cycle of forging the workpiece is repeated.

Analysis of the quality of the forgings obtained using the inventive variants of the tick head showed the absence of forging defects in the contact area of the clamped jaws with the forging.

The tick-borne head of the forging manipulator according to the claimed variants was manufactured and tested with a positive result in the production conditions of ChMZ OJSC in the manufacture of forgings with a diameter of 320 mm from zirconium alloys E125, E110, E635, E110 o.ch., E125 o.ch., from niobium and its alloys, from titanium and its alloys, hafnium and other alloys.

Compared with the closest analogue, the claimed variants of the tick head of the forging manipulator allow to obtain forgings from various refractory metals and alloys of higher quality, without forging defects (cracks, delaminations and flaws) and with a lower manufacturing cost due to an increase in metal yield and significant reduce forgings

Claims (2)

1. The tick head of the forging manipulator, comprising a housing, main clamping jaws, additional jaws mounted therein, fastening elements, control mechanisms of the main clamping and additional jaws and a tick head, characterized in that the additional jaws are made with a protective layer of zirconium dioxide or nitride work surfaces. 2. The tick head of the forging manipulator, comprising a housing, main clamping jaws, additional jaws mounted therein, fastening elements, control mechanisms of the main clamping and additional jaws and a tick head, characterized in that the additional jaws are made of zirconium alloy with a zirconium oxide film for workers surfaces.

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